Improvement in machines for turning keys



ASIG/VORS T0 THE Eaggh \umk Q 1 Machine for Turning Keys.

PATENTED JUL 25 187].

AMPHOf0-UVH06RAPHIL wan. fasfism/E's PROCESS.)

UNITED STATES PATENT OFFIoF.

' JAMES TERRY, JR., AND SWIFT MCG. HUNTER, OF TERRYSVILLE, CONNECTICUT,

ASSIGNORS TO EAGLE LOCK COMPANY, OF SAME PLACE.

IMPROVEMENT IN MACHINES FDR TURNING KEYS.

Specification forming part of Letters Patent No. 117,348, dated July 25,1871.

To all whom it may concern:

Be it known that we, J AMES TERRY, J r., and SWIFT MoG. HUNTER, ofTerrysville, in the county of Litchfield, State of Connecticut, haveinvented certain new and useful Improvements in a Machine for TurningKeys, of which the following is a specification:

()ur invention consists in the combination and arrangement of the partsas hereinafter specified.

In the accompanying drawing, Figure 1 is a front elevation of a machineembodying our invention, and Fig. 2 is a side elevation of the same.

A designates the bed, on which are securedthe head B and socket C,similar to those of an ordinary hand-turning lathe. The mandrel a isprovided with an ordinary driving-pulley, I, and has a longitudinal playin its bearing, said longitudinal movement being accomplished by meansof the bifurcated lever b, the end of which rests in the groove 0. Tothe lower end of the lever 1), inside of the bed A, another lever or armof the same lever is attached by means of a stopjoint, the two armsforming an angle or knee lever, as indicated by the broken lines inFig. 1. The lower arm of the lever b is secured to the weight (I. On theend of the mandrel ais a chuck, D, provided with an arm, h, and centeror point, e. A post, E, is secured in the socket C, in which post is aframe, F, made in two parts and connected by a joint, 2'. In each partof the frame F is secured a bit or chisel, k, which may be of anydesired form, so as to turn the whole or any portion of a key-shaftbetween the bit and the ring into any desired form. By adjusting thepost E in the socket C, and the latter upon the bed A, the chisels 7c I:can be brought so that the key clasped by them will be central, or on aline with the mandrel a. To the upper arm of the frame F is secured arod, G, the lower end of which rod passes through an arm or cross-piece,m, of the lever or treadle H, and is provided with two collars, n n,secured to the rod bymeans of set-screws. The lower end of the weightcl, or the end of a rod to which said weight is attached, also passesthrough the cross-piece m. Springs 0 and 19 have a tendencyto hold theparts in the position shown in the drawing, the spring 19 being attachedto the treadle by means of crank r, shaft 8, and strap t, in a wellknownmanner, whereby the effect of the unequal tension of the spring isremoved from the treadle.

The operation is as follows, viz.: Akey is placed with the portion to beturned between the chisels 7c is, as shown in Fig. 1. The lever ortreadle is then depressed, when the weight d and rod G will fall withsaid treadle until the upper chisel 7a meets the key and holds the samein place. The movement of the rod is then stopped until the treadle Hhas moved so far as to bring the crosspiece m in contact with the lowercollar n. During the movement of the treadle H and crosspiece m fromcollar to collar n n the falling of the weight d takes up all the slackin the stopjoint of the kneelever b, and throws the upper end of saidlever (and, consequently, the mandrel a and chuck D) forward, when thecenter e enters the usual hole in the end of the key and holds itcentral, while the arm h strikes the bit of the key and revolves thesame. Continued downward movement and pressure of the treadle H causesthe chisels k 7a to cut, and the portion of the key between them isturned. The pressure is then removed from the treadle H, when thesprings 0 and 19 cause the parts to resume theirformer position and thekey falls'from the machine, when another key can be inserted and theoperation repeated without stopping the machine. The fine broken ordotted lines in Fig. 1 indicate the position of the several parts withthe treadle depressed. If desired to turn solid keys, or those in whichthe end of the round shaft projects beyond the bit, the center 0 wouldbe removed from the chuck D, thus leaving a cavity therein to receivethe end of the key-shaft, when the key can be turned as beforedescribed. It is desirable to have the chisels k k strike the key andhold it in place previous to the key engaging with the chuck D, and alsothat the chuck shall engage with and revolve the key just previous tothe cutting action of the chisels 70 k, which action is caused by thecross-piece m striking the collar n and forcing down the rod G and upperarm of the frameF. By the adjustment of the collars n n on the rod G theseveral operations can easily be made to take place in the orderspecified.

By our invention a large amount of labor is saved over the former modesof doing the same work.

We claim as our invention- 1. The combination of the bed A, head B,sliding mandrel a ,'chuck D, lever 11, weight d,

socket C, frameF, chisels k k, rod Gr, collars a n, treadle H, andsprings 0 1), whereby a single movement of the treadle H causes the keyto be first held by the chisels la la, next made to revolve by engagingwith the chuck D, after which a further movement of the treadle causesthe chisels to cut and turn the key, as set forth.

2. The combination of the bed A, adjustable post E, socket O, jointedframe F, chisels 7c 70, with the head B and sliding mandrel and chuck aD, substantially as described and for the purposes set forth.

3. The pointed center e and arm h of the chuck D, arranged on the end ofthe sliding and revolving mandrel a, in combination With the dies orchisels 7c is and their connecting mechanism, substantially as and forthe purpose described.

JAMES TERRY, JR. SWIFT MOG. HUNTER.

Witnesses E. STRIOKLAND, 1). I. ALLEN.

